Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): The sum of the series with the $n$th term. $t_n=(9-5 n)$ is (465), when no. of terms $n=15$.
Reason (R): Given series is in A.P. and sum of n terms of an A.P. is $S _{ n }=\frac{n}{2}[2 a+(n-1) d]$

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
✓
A is false but R is true.

Answer

Correct option: D.

A is false but R is true.

(d) A is false but R is true.
Explanation: A is false but R is true

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MCQ 21 Mark

Assertion (A): Two identical solid cubes of side 5 cm are joined end to end. The total surface area of the resulting cuboid is $300 cm^2$.
Reason (R): Total surface area of a cuboid is $2( lb + bh + lh )$

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
✓
A is false but R is true.

Answer

Correct option: D.

A is false but R is true.

(d) A is false but R is true.
Explanation: A is false but R is true.

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Maths Assertion (A) & Reason (B) MCQ

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